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What is Fake Windows Defender Prevented Malicious Software Scam?

The Windows Defender Prevented Malicious Software Scam is a Trojan which belongs to the Trojan. Tech-Support-Scam family that installs on your machine to displays a fake Windows login screen. This Trojan infection pretends that the Windows defender has blocked access to the computer because malicious entities were found on your system. This is a scan that is done to trick the user into calling the listed support number so that the listed support company’s agents can sell unnecessary software and services to the innocent users. If you have been trapped and your device is the victim, it will show the following text alert:

Please Enter Product Key Windows Defender prevented an unrecognized and malicious software on your computer. Please enter your Windows Product Key. The Product Key should be on a label or the card inside the box that Windows Disk came in or in the confirmation email you received after buying it. if you have upgraded to Windows 10, you have a digital license instead of a key. A product key is a 25 character code used to active Windows. It look like this:

PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Customer Support

This tech support scam comes with a build in passcode that you can use for closing the screen and scan your computer with anti-malware program. Enter THTY4-89LK6-RTI23-XZTOP-05ERY as the product key to close the screen. Once you are able to close the screen, scan your computer to detect and remove the infection.

How your computers become the target of the Windows Defender Prevented Malicious Software Scam?

This Trojan and other such infections get installed on you devices by other programs that do not adequately disclose the presence of any other software attached with them. Some programs that you download off of the Internet install Trojan or Adware infections along with them so it is important to pay attention while installing anything online. To know if any adware, Trojan, or unusual application is going to install with the first place install, pay attention to the installation screens and license agreements.

If an installation screen offers you Advanced or Custom installation options, choose any of the option to know what other 3rd party software will also be installed along with the primary program. If the license agreement or installation screens state that any other unwanted adware or toolbar is going to install, cancel the install immediately. It is advised to you not to use such free software as they are meant to try and trick innocent users. As you can notice that the Windows Defender Prevented Malicious Software Scam is such type of scam that target users like you.

The Windows Defender Prevented Malicious Software Scam is also created to trick you into calling the listed number so that their sales representatives can convince you into purchasing unrequited software or services. This scam force you to call the given tech support number for no reason. It is recommended to you that don’t purchase any services or software program and if you purchased unknowingly, better to dispute the charges with your credit card company and to remove this Trojan and any related software, go through the removal guide given below.

Step 1: Reboot into Safe Mode with Networking

Reboot your computer into Safe Mode with Networking by using the instructions for your version of Windows written in the following tutorial:

How to start Windows in Safe Mode

Rather than just Safe Mode, choose Safe Mode with Networking. When the computer reboots into Safe Mode with Networking, login with the username you normally use continue with the rest of the steps when you are at your Windows desktop.

To run administrative and diagnostic tasks on your installation, Windows Safe Mode is a way of booting up your Windows operating system.  The operating system only loads the bare minimum of software required for the operating system to work when you boot into Safe Mode.

For Windows 7, Windows 8 and Windows 10, there are two methods of booting into Safe Mode.

Windows 7

Using the F8 Method:

  • Restart your machine.
  • While your computer getting start, you will find that your computer’s hardware being listed. When you see this information, tap the F8 key on your keyboard repeatedly until you see the Windows 7 Advanced Boot Options screen as shown in the image below.advanced-boot-options-windows-7-

                                                Fig. Windows 7 Advanced Boot Options screen

  • Choose the Safe Mode option you want using the arrow keys.
  • Now hit on the enter key on your keyboard to boot into Windows 7 Safe Mode.
  • You will be at a typical logon screen, when Windows starts. Logon to your machine and Windows 7 will enter Safe mode.
  • Perform whatever tasks are required and reboot to go back into normal mode once when you are done.

Using the System Configuration Tool Method:

Note: You should not use this method if you are facing issues in entering Safe Mode via the F8 method as it is not a good idea to force the machine to startup into safe mode. Close any running programs and open Windows to get back at the desktop.

  • Click on the Start button and type msconfig in the Start Menu Search Box as shown in Figure below and press the Enter key on your keyboard. search

                                                                     Fig. Windows 7 Search box

  • After hitting the Enter key, the System Configuration utility will open similar to the one below. system-configuration-general-tab

                                                        Fig. Windows 7 System Configuration Utility

  • In the System Configuration screen, click on the Boot tab.
  • You will see the screen with multiple Boot options as shown below.Working with Boot Configuration Data_2.jpg

                                 Fig. Windows 7 Boot tab in the System Configuration utility

  • There is a checkbox labelled as Safe boot, put a checkmark in that
  • Click on the Apply button and then the OK button.
  • Clicking on OK button, a prompt will reflecting stating that you need to reboot the computer to apply the change.msconfig-3

                                                                           Fig. Restart Prompt

  • Reboot your computer by clicking on the Restart button.
  • Your computer will now restart directly into Safe Mode. When you get to the Windows 7 logon screen, log on to the computer and perform any necessary functions.
  • Once done with your tasks, start msconfig, from within Safe Mode.
  • When the program is open, and you are on the General tab, choose the option labelled as Normal Startup.
  • Then click on the Apply and then on the OK button.
  • When the computer prompts you to reboot, allow it to reboot, and you will boot back into Windows 7 in normal mode.

Windows 8/Windows 10:

All the steps are almost similar to reboot in safe mode if you are using Windows 8 or Windows 10 computer.

How to start Windows 8 and Windows 10 in Safe Mode

Using the Advanced startup options method:

  • Point the cursor on the Windows Start screen and type Advanced startup in the search box which will reflect multiple search results. Among those search results that appear, click on the Settings and then click on the Advanced startup options search option.
  • Scroll down the Settings screen that opens, and under the Advanced Startup category, there will be the Restart now button, click on that to Restart your computer.
  • Click on the Troubleshoot option, when the Advance startup menu comes up.
  • Now click on the Advanced Options button.
  • Then click on the Startup Settings option and then on the Restart button which will restart your computer once again.
  • When you are on the Startup Settings screen, press any number for the Safe Mode option.
  • Perform the required tasks and once you are done, reboot to go back into normal mode.

 

Using the System Configuration Tool Method:

Note: If you are facing issues in entering Safe Mode via the Advanced Startup menu, better not to use this method to force your machine to startup into safe mode.

  • Click on the Windows Start screen and type msconfig in the search box and when the msconfig search results appear, click on it.
  • The last will show a System Configuration window similar to the one shown below.system-configuration-general-tab
  • In System Configuration window, click on the Boot tab.
  • Now you will now see the Boot screen as shown below.Working with Boot Configuration Data_2.jpg
  • There is a checkbox labelled as Safe boot, put a checkmark in that
  • Click on the Apply button and then the OK button.
  • Clicking on OK button, a prompt will reflecting stating that you need to reboot the computer to apply the change.msconfig-3
  • Reboot your computer by clicking on the Restart button.
  • Your computer will now restart directly into Safe Mode. When you get to the Windows 7 logon screen, log on to the computer and perform any necessary functions.
  • Once done with your tasks, start msconfig, from within Safe Mode.
  • When the program is open, and you are on the General tab, choose the option labelled as Normal Startup.
  • Then click on the Apply and then on the OK button.
  • When the computer prompts you to reboot, allow it to reboot, and you will boot back into Windows 8 or Windows 10 in normal mode.

Issues that may encounter if you are forcing the machine to boot up in Safe Mode using the System Configuration Utility

As described above, it is possible to continuously boot up your machine into safe mode using the System Configuration utility. The System Configuration program makes it possible by changing your boot.ini file, the settings file which configures your computer’s boot sequence, and including the /safeboot argument to your operating systems startup line. For instance,

Original               

[operating systems]

multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=”Microsoft Windows XP Professional” /FASTDETECT /NOEXECUTE=OPTIN

After using MsConfig.exe

[operating systems]

multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=”Microsoft Windows XP Professional” /FASTDETECT /NOEXECUTE=OPTIN /safeboot:minimal

Once done using safe mode, next you would run the System Configuration utility again and uncheck the /Safeboot option, which will remove the /safeboot argument from the boot.ini file, and allow your device to boot up normally.

This is normally not a problem on a machine which is operating properly, but if your device is infected and has got malware, it may trick to delete certain Windows Registry keys and as a result your computer can not properly boot into safe mode. If this is the case with you also, boot into safe mode using the System Configuration utility can cause the computer inoperable.  This happened because once you set the computer to boot into Safe Mode using /Safeboot, it will try to start in Safe Mode continuously until the /safeboot argument is removed from the boot.ini. As malware is not letting the device to actually boot into safe mode, there is no way of to get a point where you can run the System Configuration utility again to uncheck the /Safeboot option. This makes you to stuck in a situation from where your computer continuously tryto get into safe mode, but not able to do so.

You may get out of this situation by renaming your boot.ini file. The first step is, use a boot disk to start your computer and if in case your computer does not support a floppy disk, then you can boot off the Windows CD which came along with your computer for the purpose of accessing the Windows Recovery Console. Once booted to a command prompt, rename your C:\Boot.ini file to another name like C:\Boot.ini.bak. The command that you can use to rename the file at the command prompt is:

ren C:\Boot.ini Boot.ini.bak

Once you have renamed the file, remove the boot disk and reboot your computer which will get it back to normal mode. If you are booting up after the rename, don’t get surprised if you see an error stating that you do not have a valid Boot.ini file. You can then rename C:\Boot.ini.bak to C:\Boot.ini when you get back to normal Windows mode and run Msconfig again to remove the /safeboot flag.

Step 2: Download defencebyte AV Pro to Scan and Delete the Windows Defender Prevented Malicious Software Scam

To avoid the fall victim the Windows Defender Prevented Malicious Software Scam and such other scams, install defencebyte AV pro to scan and find infection on your device. If the infection is found, delete it using the defencebyte AV Pro when it prompts you to remove it. All the steps to download defencebyte AV Pro and scan your system are given below:

Download defencebyte AV Pro to Scan and get rid of the Windows Defender Prevented Malicious Software Scam

  • Download and install the defencebyte AV Pro
  • Make sure that you have picked the right version for your Windows System.
  • Choose a convenient location to save the file.
  • Windows will prompt when the download will be completed.
  • Click on Run option to start the program or browse the location of the folder and double click on the file defencebyteAVPro_.exe.
  • Accept the terms to continue the remaining process.
  • Perform the scan on your computer to find plug-ins, add-ons, harmful programs, and other malicious entities.
  • Further, implement the on-screen instructions to continue with the removal.
  • Reboot your machine for everything to take effect, once scan and removal process is done.

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